MARK started his singing career as a member of boy band NCT in April 2016 when he featured on the debut digital single “The 7th Sense,” as part of subunit NCT U — NCT consists of 23 members. MARK is also part of NCT’s other subunits — NCT 127, NCT DREAM and supergroup SuperM. Before his debut, SM Entertainment revealed MARK back in 2013 as one of its SM Rookies, which was the agency’s pre-debut training team to promote its upcoming artists. MARK mainly raps on NCT’s songs and has also competed in Mnet’s rap competition show for high schoolers “High School Rapper,” (2017-21) in 2017. MARK ranked seventh in the final round. In February 2022, MARK released his first solo single “Child,” and he recently released his second single "Golden Hour," on April 7, 2023.